Carburetor



"',Qcn v. 1924,

J HURs-r CARBURETOR Flled Feb 2.7 1923 v new and usefu-l Carburetor, of which the- Patented Oct. 7, 1924.

JAMES HURST, 0F SAN FRANCISCO, CALIFORNIA.

CARBURETOR.

Application filed February 27, 1923. Serial No. 621,630.

T0 all whom t may concern.'

Be it known that I, JAMES HURs'r, a citizen of the United States, residing at San Francisco, in the county of San Francisco and Statel of California, have invented a following is a specication.

This invention is a device for effecting the mixing of hydrocarbon and air, in the production of the usual explosive mixture required for the operation of internal combustion engines.

One of the objects of the invention is to provide a carburetor constructed to overcome the annoyances incident to the loss in buoyancy of the floats commonlyemployed to regulate. the supply of 4hydrocarbon to the float chamber. A further object is to provide a float-like control member for the inlet valve of the float chamber of a car buretor, said member having approximately the same specific gravity as that of the fluid which it displaces, and a valve actuated thereby.

The invention will be hereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawing p Figures 1 and 2 are vertical Sectional views illustrating two dilferent types of well known carburetors now in general use, with the invention applied thereto.

Referring to Figure 1 of the drawing, 10 designates a carburetor casing, provided with the usual mixing chamber 11, and a float chamber 12. Said float chamber com- ,municates with the mixing chamber 11 through a nozzle 18, the outlet end of which is located within the usual Venturi tube 14. The float chamber is also provided with the usual supply conduit 15. ivotally mounted within the float chamber is a lever 16, toone end of which is secureda valve 17, normally closing the inlet 15. To the, other end of the lever is secured a semi-buoyc nt actuator 18.

In practice, the actuator 18 is so constructed as to be as near as'possible of the same density or specifi-c gravity as that of the liquid in which it isto operate. In other words, it practically has no buoyancy with respect to said liquid. y The closer the weight of the. actuator to that of the liquid which it displaces,y the greater the amount of power or pressure that is available for opening the valve 17. Experiment has demonstrated that an actuator made of .oak

wood will operate very satisfactorily in gasoline or the like, because its density is very close to theV specific gravity of the gasoline, and it is the cheapestwood ob`- tainable having this quality. The operation of the device is not impaired by the actuator becoming waterlogged. Itis to be understood'th'at the invention is not limited to an actuator constructed of oak wood, because the same may be constructed of various other materi'alsand forms. For instance, it may be constructed in any of the various forms illustrated in my several copending 'applications for patent.

TheI valve 17 is illustrated as being hollow and abnormally large, and is filled with lead or other heavy material, having a. substantially greater specificgravity than that of gasoline, the` weight of they valve serving to maintain it on its seat when they ,i

actuator is submerged within the liquid contained within the float chamber.

In operation, assuming the ioat chamber 12 to be empty, the actuator will be de-v pressed and the weight thereof will be sulficient to hold the valve 17 raised` from its seat. A s the liquid level riseswithin the chamber 12, the actuator 18 becomes subcomplete or partial submergence allows the weight 19 to move the valve l17 to its seat. The vweight of the valve is sufficient.' to resist the gravity pressure of the gasoline and to stop the flow thereof when the. valve is seated, the seating of the valve being effectedwhen the chamber is lilled to the desired level. As soon as thev liquid level starts to lower, the weight of the. actuator 18 is exerted upon the lever 16, thereby actingto `runseat' the weightedvalve 17. During the normal operations of the carburetor,the -actuator will continue to func-` tion, to regulate the position of the valve 17, whereby gasoline is admitted or shut p i off, as the case may be, so as to maintain a` normal working level within` the chamber 12, the eect being the same as thatnob tained by use of the Iordinary type of float.

In the form of carburetor illustrated in p Figure 2, the actuator 18EL is located within a float chamber 12, which is located within a casing separate and distinct from that containing the mixing chamber. The valve 17a, provided with the weighted material 19a, is actuated by means of levers 20, pivot-ally mounted within the float chamber, and positioned to engage notches 21 in the valve stem. Said levers are extended to positions where they will be engaged by the actuator 18, as the latter moves downwardly under the act-ion of gravity, when the liquid level is lowered.

In operation, as the liquid level rises within the chamber 12a, the actuator 18a becomes whol'ly or partially submerged, whereby its weight is neutralized, whereupon the weight 19a is free to force the valve 17a to its seat. As the level lowers, the weight of the actuator is applied to the levers 20, thereby raising the valve 17a. vThe functioning of the device will be readily understoody from what has already been stated in connection with the device illustrated in Figure l.

The advantages of the invention will be readily apparent to those skilled in the art to which it appertains. It will be observed that a valve actuator of simple construction is: provided, which overcomes the annoyances incident to the loss of buoyancy of the floats now in common use, because the functioning of the present device is in no way dependent upon the ability of the actuator to float. Therefore its operation is in no way impaired by becoming water-logged, thus insuring perfect operation under the usual carburetor conditions.

Having thus explained the nature of 'the invention, and described an operative manner of constructing and using the same, al though without. attempting to set forth all of the forms of its use, or all of the forms in which it may be made, what is claimed is.:-

1. A. carburetor of the character described comprising a casing provided with float chamber having an inlet and an ont-let, an inlet valve actuator movably mounted within said chamber, said actuator being of approximately the same specific gravity as that of the fluid to be supplied to said chainber, whereby it will normally tend to submerge itself in the fluid in the said chamber, and an inlet valve for said chamber of sufficient weight to seat itself during submergence of said actuator.

2. A carburetor of the character described comprising a. casing provided with a float chamber having an inlet and an outlet, a lever pivotally mounted in said float chamber, an actuator of approximately the same specific gravity as that of the liquid to be supplied to said chamber, whereby it will normally tend to submerge itself in the fluid entering said chamber, said actuator being secured to one end of said lever, and an inlet valve secured to the other end of said valve lever, said valve being of sufficient weight to seat itself during submergence of said actuator.

3. A carburetorl of the character described comprising a casing provided with a fioat chamber having an inlet and an outlet, an actuator mov'ably mounted within said chamber, said actuator being of approximately the same specific gravity as that of the liquid to be supplied to said chamber, whereby it will normally tend to submerge itself in the fluid in the said chamber, and an inlet valve controlled by said actuator, said inlet valve having sufficient weight applied thereto to= cause it to seat itself during submergence of said actuator.

4. A carburetor of the character described comprising a casing provided with a fioat chamber having an inlet and an outlet, a lever pivotally mounted in said float chamber, an actuator of approximately the same specific gravi-ty as that of the liquid to be supplied to said chamber, whereby it will normally tend to submerge itself in the fluid entering said chamber said actuator being secured to one end of said lever, and an inlet valve secured to the otherI end of said lever, said valve being` of sufficient weight to seat itself during submergence of said actuator, the unsubmerged actuator being normally heavier than the weighted valve.

5. A carburetor of the character described comprising a casing provided with a float chamber having an inlet and an outlet, an actuator movably mounted within said chamber, said actuator being of approximately the same specific gravity as that of the liquid to be supplied to said chamber, whereby it will normally tend lto submerge itself in the fluid entering said chamber, a hollow inlet valve controlled by said actuator, and a filling ofI weighting materl within the hollow portion of said valve, said material being sufficiently heavy to seat said valve during submergence of the actuH ator, the unsubmerged actuator being normally heavier than the weighted valve.

6. Acarburetor o-f the character descril ed comprising a casing provided with a float chamber having an inlet and an outlet, a lever pivotally mounted in said float chamber, an actuator of approximately the same specificy gravity as that of the liquid to be supplied to said chamber, whereby it will normally tend to submerge itself in the fluid entering said chamber, said actuator being i the Weighted valve being normally lighter in Weight than the unsubmerged actuator.

7. A carburetor of the character described comprising a casing pro-vided With a float chamber having an inlet and an outlet, a valve actuator of approximately the same Spec-iic gravity as that of the liquid to be supplied to said chamber-5 whereby it will normally tend to submerge itself in the fluid entering Said chamber and a Weighted valve normally weighing less than the actuator,-

Said actuator and said valve being` assooiated to move in unison said Valve being of suflic-ient Weight to seat itself during submergence of said actuator.

In testimony whereof I have hereunto set m hand.

y JAMES HURST. 

